One of the members of the Tube Clock Database Facebook Page shared a link to a nixie tube screen saver that he created. I don't have a Windows computer to try it out on but if you've used it, let me know how it goes in the comments.
The TubeClockDB / Tube Clock Database is a collection of nixie clocks, vfd clocks, vacuum fluorescent clocks, crt clocks, scope clocks and oscilloscope clocks. We will feature just about anything: fully assembled clocks ready to purchase, kits, or even individual nixie tubes. If there is something that you think would make this a better resource, please contact us.